Hi, my mountain-bike has recently developed a very annoying, and quite loud, clicking noise when any torque is applied to the bars (sometimes even when touching or letting go of the bars). Happens whether the bike is moving or stationary. I've tried swapping both the bars and the stem, but the noise is exactly the same, so I assume it must be caused by something else. While the stem was off, i checked the headset (but didn't disassemble it), and it looked clean (only been on a couple of months anyway). I also checked and cleaned the front skewer. None of this had any effect.
I've tried searching the forums, but most threads seemed to revolve around the stem/bar clamp, which I've already checked. Can anyone suggest what i should try next?